Substance A and B are mixed together. To separate the mixture, water is added, and substance A is filtered out . Then, the remaining liquid is heated to remove the water leaving substance B could be correct?

To evaluate which option correctly follows the described method of separation (adding water, filtering out substance A, and heating to remove water to leave substance B), let's analyze each option:

**A. Substance A is sodium and substance B is chloride; they had reacted together as sodium chloride.**
- Sodium and chloride react to form sodium chloride. When mixed with water, sodium chloride dissolves, and thus filtering would not separate them. This option does not fit because both substances are already combined into one soluble substance.

**B. Substance A is rice, Substance B is sugar**
- Rice and sugar do not dissolve in water the same way, but if mixed with water, rice will cook and the sugar might dissolve. However, filtering will not effectively separate them as the rice would remain as a solid and sugar dissolved in water would not be removed by filtration. This option is not effective.

**C. Substance A is alcohol, and substance B is salt**
- Alcohol does not mix with water, but salt does. When water is added, the salt would dissolve, and if you filter, you will separate salt from the remaining mixture. Heating the liquid would evaporate the water, leaving alcohol behind. This option could potentially work under certain circumstances.

**D. Substance A is salt and substance B is also salt**
- If both are salts, when mixed and water is added, both would dissolve. Filtering would not separate them since both salts would remain in solution. This option does not fit as both substances would still be dissolved in the water.

Considering these analyses, option **C** (Substance A is alcohol, and substance B is salt) is the most appropriate and feasible scenario for the described process of separation.